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• W2977187588 abstract "Improvements in laboratory techniques and clinical protocols have led to increasing livebirth rates from in vitro fertilization (IVF). Despite this impact, the reproductive potential of patients remains a primary determinant of success. It is therefore of interest to investigate any environmental factors that may influence this potential. As delivery rates from spontaneous conception vary according to season, outcomes from IVF may also be season-dependent. The present study was designed to test the hypothesis that there is an association between season at IVF cycle start and clinical pregnancy. Retrospective cohort of 5,878 fresh embryo transfers. Start dates for all autologous cycles resulting in fresh cleavage or blastocyst stage transfers performed in our IVF program between January 2012-December 2017 were categorized by season (Spring: March, April, May; Summer: June, July, August; Fall: September, October, November; Winter: December, January, February). Dates were linked to local temperature (min, max, average) and day length measurements obtained from meteorological records (www.wunderground.com). Average maximum temperature and day length were categorized into tertiles. Multivariable logistic regression, adjusted for age and quadratic age, was used to model odds of clinical pregnancy, defined as presence of fetal sac. Patient characteristics were similar among seasons. As expected, temperature and day-length varied by season. When compared with cycles started during Winter, there was no difference in clinical pregnancy rate in Spring (OR: 1.08, 95% CI: 0.94-1.25), Summer (OR: 1.10, 0.95-1.27), or Fall (OR: 1.02, 0.88-1.19). Comparisons of clinical pregnancy by month of cycle start revealed that cycles started in June (45.6%) and July (45.1%) had 38% greater odds of clinical pregnancy compared to cycles that started in January (37.5%) (OR: 1.38, 1.08-1.77 for June; OR: 1.38, 1.08-1.76 for July). No other comparisons by month reached statistical or clinical significance. There was a positive linear trend between day-length and clinical pregnancy (P-value, test for linear trend=0.05) but no association with average temperature (P-value, test for linear trend=0.52). Our results do not support the hypothesis that clinical pregnancy after fresh transfer is associated with season at cycle start. However, our more detailed analyses found greater odds of clinical pregnancy for cycles started in June and July compared with January and a positive linear trend between clinical pregnancy and day-length, but not temperature. Together, these findings suggest an association between maternal light exposure and outcomes from IVF. The exact mechanism underlying this association is not known but may implicate a role of melatonin and/or Vitamin D on improved oocyte quality and/or endometrial receptivity." @default.
• W2977187588 created "2019-10-03" @default.
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• W2977187588 date "2019-09-01" @default.
• W2977187588 modified "2023-10-18" @default.
• W2977187588 title "The association between season at cycle start and clinical pregnancy following fresh embryo transfer" @default.
• W2977187588 doi "https://doi.org/10.1016/j.fertnstert.2019.07.971" @default.
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